Carrying Amounts and Fair Values of Financial Instruments Measured based on Level Two Inputs (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured debt	$ 244,336
Cash surrender value of life insurance		1,200
Deferred compensation liability		1,200
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured debt	242,018	339,623
Participating note		643
Interest rate swap liabilities	16	239
Interest rate cap asset	13	9
Cash surrender value of life insurance		1,196
Deferred compensation liability		1,249
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured debt	244,336	334,438
Participating note		643
Interest rate swap liabilities	16	239
Interest rate cap asset	13	9
Cash surrender value of life insurance		1,196
Deferred compensation liability		$ 1,249